Common renter mistakes include skipping measurements, neglecting surface preparation, and using adhesives that damage walls. Ignoring these steps can cause uneven wallpaper, peeling paint, and loss of deposit. To avoid this, always measure spaces twice, clean surfaces before applying peel-and-stick products, and select gentle adhesives designed for rentals. Taking time on prep work ensures your upgrades stay looking fresh and removable without risking permanent damage to your rental space.